脉动风场下风沙流结构的数值模拟

摘要/Abstract

摘要： 基于野外观测实验和Langevin方程对风场脉动的描述, 研究了脉动风场下沙粒的跃移运动以及风沙流结构特征。结果表明,脉动风场对沙粒的跃移运动有着显著的影响,沙粒粒径越小,脉动风场对跃移运动轨迹的影响越大;考虑风场脉动时给出的风沙流结构具有明显的分层特征,并与实验测量结果吻合得更好。

关键词: 脉动风场, 风沙流结构, 数值模拟, 跃移运动, 风沙耦合

Abstract: Based on experiment and the description of fluctuating wind field by Langevin equation, the characteristics of saltating grains as well as the windblown sand cloud have been discussed. The numerical simulations demonstrate that the fluctuating wind field exerts a great influence on saltation of grains, and the smaller the grain size is, the greater the influence would be. Moreover, the windblown sand cloud in the fluctuating wind field also shows a stratified characteristic and the mass fluxes agree well with the previous experiments.

Key words: fluctuating wind field, windblown sand cloud, numerical simulation, saltation, coupled interaction between sand movement and wind field

中图分类号:

X169

武建军;罗生虎;闫光虎;何丽红. 脉动风场下风沙流结构的数值模拟[J]. 中国沙漠, 2011, 31(3): 602-606.

WU Jian-jun;LUO Sheng-hu;YAN Guang-hu;HE Li-hong. Numerical Simulation on Windblown Sand Cloud in the Fluctuating Wind Field[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(3): 602-606.

参考文献

[1]Bagnold R A.The physics of blown sand and desert dune[M].New York:William Morrow,1941.
[2]董治宝.中国风沙物理研究五十年[J].中国沙漠,2005,25(3):293-303.
[3]王涛.干旱区绿洲化、荒漠化研究的进展与趋势[J].中国沙漠,2009,29(1):3-11.
[4]Zheng X J.Mechanics of Wind-blown Sand Movement[M].German:Springer,2009.
[5]Zheng X J,Huang N,Zhou Y H.Laboratory measurement of electrification of wind-blown sands and simulation of its effect on and saltation movement[J].Journal of Geophysical Research,2003,108:D104322.
[6]屈建军,井哲帆,张克存,等.HDPE蜂巢式固沙障研制与防沙效应实验研究[J].中国沙漠,2008,28(4):3-8.
[7]董治宝,钱广强,罗万银,等.几种常用风沙颗粒测速方法对比[J].中国沙漠,2010,30(4):9-17.
[8]Van Dop H.Random walk models for particle displacements in inhomogeneous unsteady turbulent flows[J].Physics of Fluids,1985,28(6):1639-1653.
[9]Legg B J,Powell F A.Spore dispersal in a barely crop:A mathematical model[J].Agricultural Meteorology,1982,20:47-67.
[10]Butterfield G R.Grain transport rates in steady and unsteady turbulent airflows[J].Acta Mechanica(Suppl.),1991,1:97-122.
[11]Stout J E,Zobeck T M.Intermittent saltation[J].Sedimentology,1997,44:959-970.
[12]Anderson R S.Eolian sediment transport as stochastic process:The effects of a fluctuating wind on particle trajectories[J].Journal of Geology,1987,95:497-512.
[13]刑茂,郭烈锦.紊流风场中起跳沙粒的轨迹特征[J].中国沙漠,2003,23(6):628-631.
[14]Shao Y P.A similarity theory for saltation and application to aeolian mass flux[J].Boundary-Layer Meteorology,2005,115:319-338.
[15]郑晓静,王萍.风沙流中沙粒随即运动的数值模拟研究[J].中国沙漠,2006,26(2):184-188.
[16]Wang P,Zheng X J,Hu W W.Saltation and suspension of wind-blown particle movement[J].Science in China(Series G),2008,51(10):1586-1596.
[17]Owen P R.Saltation of uniform grains in air[J].Journal of Fluid Mechanics,1964,20:225-242.
[18]Anderson R S,Haff P K.Wind modification and bed response during saltation of sand in air[J].Acta Mechanica(Suppl.),1991,1:21-25.
[19]Anderson R S,Hallet B.Sediment transport by wind:Toward a general model[J].Bulletin of Geological Society of America,1986,97:523-535.
[20]Zhou Y H,Guo X,Zheng X J.Experimental measurement of wind-sand flux and sand transport for naturally mixed sands[J].Physical Review E,2002,66,021305.